scale 64 bit fix for warning on ios where int width doesnt match %2 size which is 64 bit by default.  change size to explicitely 32 bit with %w2. BUG=437 TESTED=try bots R=bcornell@google.com
scale 64 bit fix for warning on ios where int width doesnt match %2 size which is 64 bit by default.  change size to explicitely 32 bit with %w2.
BUG=437
TESTED=try bots
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/43339004
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